We are on the Galaxy Nov. 24th. Does anyone know if it is better and/or faster to arrange private transfers to the airport or use Celebrity transfers? Thanks

Yes, the Celebrity transfer has to drop a brunch of people off at different hotels and a private transfer or cab will drop you right off at your hotel. I wish I had booked a private transfer. I almost missed my Vatican tour because my luggage was mistakenly removed early and went to the wrong hotel. The airlines didn't lose my luggage but the transfer company did. I was lucky I found it pretty quickly, it was dropped off at the wrong hotel, but I could have save a lot of time and stress with a private car.